lab 2 freezing point depression.pdf

Using the calculated moles the molecular weight of

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Using the calculated moles, the molecular weight of the unknown solute was determined to be 85 g/mole. 2. Data table #1 (for the pure solvent) and Data table #2 (for the unknown MW determination) with all the data (like those found on page 9 of the lab manual). Results table #3 with all the data (like the one found on page 12 of your lab manual). Please be sure to include your partner’s name. Data Table #1 Lab partner: Harrison Longano Mass of test tube + solid cork 45.352 g Mass of test tube + solid cork + p-xylene 67.373 g Mass of p-xylene 22.021 g
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3. Show the calculation for obtaining the mass of p-xylene used in the experiment. (mass of test tube + solid cork + p-xylene) - (mass of test tube + solid cork) 67.373 g - 45.352 g = 22. 021 g p-xylene 4. Show the calculation for obtaining the mass of unknown added. State whether the unknown was a solid or liquid. Unknown E was a liquid unknown. (mass of test tube + cork + liquid unknown) - (mass of test tube + cork) 69.020 g - 67. 323 g = 1.697 g unknown 5. A freezing point graph of the pure p-xylene as well as the freezing point graph of the solution must be in your report. Use Excel (or some other graphing program) to generate your graph via computer. See the instructions for this graph on AsULearn by clicking on the link under the “Freezing Point Depression” topic. A large portion of your grade on this lab report will be based on the graph. Therefore, you should spend an appreciable amount of time making sure it is done properly and follow your instructor’s formatting guidelines.
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